The direct-acting solenoid valve starts faster than the pilot. If it is used for quick cut-off, it is recommended to use the direct-acting type. In addition, the pilot-operated solenoid valve has a larger flow capacity than the direct-acting one. Generally, the CV can reach 3 Above, the direct-acting solenoid valve generally has a CV less than 1. The direct-acting solenoid valve starts at 0 pressure, while the pilot-operated solenoid valve must have pilot pressure, which is generally around 2 bar. The power of the direct-acting type is larger than that of the pilot type. The pilot type has higher requirements on the purity of the compressed air, while the direct-acting type is not so strict.
Direct-acting solenoid valves generally belong to small-diameter, low-pressure environments. The opening of this type of valve does not require the minimum pressure of the medium. Pilot-operated solenoid valves are generally large-diameter, high-pressure. The opening requirements of this type of valve The minimum pressure of the solenoid valve cannot be lower than 0.05MPa, otherwise the solenoid valve cannot be opened!
